US20210260928A1 - Heavy load tire - Google Patents
Heavy load tire Download PDFInfo
- Publication number
- US20210260928A1 US20210260928A1 US17/254,084 US201917254084A US2021260928A1 US 20210260928 A1 US20210260928 A1 US 20210260928A1 US 201917254084 A US201917254084 A US 201917254084A US 2021260928 A1 US2021260928 A1 US 2021260928A1
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- Prior art keywords
- groove
- circumferential
- tire
- lateral
- width direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000694 effects Effects 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
- B60C11/0309—Patterns comprising block rows or discontinuous ribs further characterised by the groove cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1392—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0344—Circumferential grooves provided at the equatorial plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0348—Narrow grooves, i.e. having a width of less than 4 mm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0372—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane with particular inclination angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0381—Blind or isolated grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
- B60C2011/133—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising recesses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
- B60C2200/065—Tyres specially adapted for particular applications for heavy duty vehicles for construction vehicles
Definitions
- the present invention relates to heavy load tires.
- a groove width of a lateral groove provided in a heavy load tire may be large (Patent Document 1).
- Patent Document 1 A groove width of a lateral groove provided in a heavy load tire may be large (Patent Document 1).
- the groove width of the lateral groove is large as in a case of the heavy load tire according to Patent Document 1, air easily flow into the lateral groove during traveling, and a tread portion is cooled by the air. Therefore, a heat storage in the tread portion is small.
- Patent Document 1 Japanese Patent Application Publication No. 2014-8904
- the present invention provides a heavy load tire capable of efficiently cooling a tread portion even when a groove width of a lateral groove is small.
- a heavy load tire comprises a plurality of circumferential grooves extending along a tire circumferential direction; a plurality of lateral grooves extending along a tire width direction and formed in a direction crossing the circumferential grooves; and a plurality of blocks partitioned by the circumferential grooves and the lateral grooves.
- the tread portion can be efficiently cooled.
- FIG. 1 is a plan view showing a tread surface of a heavy load tire according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view along line A-A of FIG. 1 .
- FIG. 3 is a cross-sectional view along line B-B of FIG. 1 .
- FIG. 4 is a plan view showing the tread surface of the heavy load tire according to an embodiment of the present invention.
- FIG. 5 is a graph showing the relationship between each tire position and belt temperature.
- FIG. 6 is a plan view showing the tread surface of the heavy load tire according to an embodiment of the present invention.
- FIG. 7 illustrates air flow
- FIG. 8 is a plan view showing the tread surface of the heavy load tire according to an embodiment of the present invention.
- the configuration of a heavy load tire 100 will be described with reference to FIG. 1 .
- the heavy load tire 100 according to the present embodiment is applied to a heavy load vehicle such as a construction vehicle.
- a circumferential groove 10 (first circumferential groove) extending along a tire circumferential direction is formed.
- the circumferential groove 10 is formed on a tire equator line CL.
- a circumferential groove 11 a (second circumferential groove) is formed on right side of the circumferential groove 10 so as to be adjacent to the circumferential groove 10 along the tire width direction.
- a circumferential groove 11 b (second circumferential groove) is formed on left side of the circumferential groove 10 so as to be adjacent to the circumferential groove 10 along the tire width direction.
- a plurality of lateral grooves communicates with the circumferential groove 10 and the circumferential groove 11 a are formed.
- the lateral grooves 14 a (third lateral groove) and the lateral grooves 14 b are formed so as to be adjacent to each other along the tire circumferential direction.
- the lateral grooves 14 a and 14 b are formed along the tire width direction.
- the groove width of the lateral groove 14 a and the groove width of the lateral groove 14 b is 3 mm to 30 mm.
- a plurality of center blocks 30 are partitioned by the circumferential groove 10 , the circumferential groove 11 a , the lateral groove 14 a , and the lateral groove 14 b .
- the center blocks 30 are formed in a center area of the heavy load tire 100 .
- the center area is defined as an area in the vicinity of the center in the tire width direction from the circumferential groove 10 to the circumferential groove 11 a (the circumferential groove 11 b ).
- a circumferential groove 12 a (third circumferential groove), a shoulder block 32 , and a shoulder groove 17 are formed.
- the shoulder groove 17 opens at a tread surface end TE and communicates with the circumferential groove 12 a and the lateral groove 15 a .
- the circumferential groove 12 a is formed on the right side of the circumferential groove 11 a so as to be adjacent to the circumferential groove 11 a along the tire width direction.
- the shoulder area is defined as an area located outside the center area in the tire width direction.
- the tread surface end TE is an outermost position in the tire width direction of a tire surface (tread surface) in contact with the ground.
- the circumferential groove 12 a (the circumferential groove 12 b ) is formed outside the circumferential groove 11 a (the circumferential groove 11 b ) in the tire width direction.
- a plurality of lateral grooves communicate with the circumferential grooves 11 a and the circumferential grooves 12 a (the lateral grooves 15 a and 15 b ) are formed.
- the lateral grooves 15 a (first lateral groove) and the lateral grooves 15 b (second lateral groove) are formed along the tire width direction.
- the lateral groove 15 a and the lateral groove 15 b have one bending point.
- the lateral groove 15 a and the lateral groove 15 b are inclined in the tire width direction from outside in the tire width direction toward the tire equator line CL with the bending point as a boundary.
- a plurality of intermediate blocks 31 are partitioned by the circumferential groove 11 a , the circumferential groove 12 a , the lateral groove 15 a , and the lateral groove 15 b .
- the intermediate blocks 31 are formed between the center blocks 30 and the shoulder blocks 32 .
- the groove width of the lateral groove 15 a and the groove width of the lateral groove 15 b is 3 mm to 30 mm.
- one end of the lateral groove 15 a and the lateral groove 15 b communicates with the circumferential groove 11 a , but does not communicate with the lateral groove 14 a or the lateral groove 14 b .
- a position where one end of the lateral groove 15 a and the lateral groove 15 b communicates with the circumferential groove 11 a is the center of the center blocks 30 in the tire circumferential direction.
- the position where one end of the lateral groove 15 a and the lateral groove 15 b communicates with the circumferential groove 11 a is near the center of the center blocks 30 in the tire circumferential direction, a slight deviation is allowed.
- the pitches of the center blocks 30 and the intermediate blocks 31 are deviated in the tire circumferential direction.
- One end of the lateral groove 15 a communicates with the circumferential groove 11 a
- the other end of the lateral groove 15 a communicates with the circumferential groove 12 a and the shoulder groove 17
- one end of the lateral groove 15 b communicates with the circumferential groove 11 a
- the other end of the lateral groove 15 b communicates with the circumferential groove 12 a
- the other end of the lateral groove 15 b does not communicate with the shoulder groove 17 .
- the lateral grooves 15 a and 15 b communicating with the circumferential groove 11 a and the circumferential groove 12 a . That is, in the plurality of lateral grooves (the lateral grooves 15 a and 15 b ) communicating with the circumferential groove 11 a and the circumferential groove 12 a , there are lateral grooves communicating with the shoulder groove 17 (the lateral groove 15 a ) and lateral grooves not communicating with the shoulder groove 17 (the lateral groove 15 b ).
- a groove 18 is formed at a part of a stepping end of the intermediate block 31 .
- a notch 19 is formed at a part of the kick-out end of the intermediate block 31 .
- the stepping end of the intermediate block 31 is a portion that contacts the ground first when the heavy load tire 100 rotates. As shown in FIG. 3 , on the wall surface of the stepping end of the intermediate block 31 , the groove 18 is formed toward the tire radial direction. The groove 18 and the notch 19 will be described later.
- an inclined portion 20 inclined inward in the tire radial direction toward the end portion is formed on a whole surface of the stepping end of the center blocks 30 in the tire width direction.
- the inclined portion 20 inclined along the tire circumferential direction is formed on the whole surface of one end in the tire circumferential direction of the center block 30 .
- the inclined portion 20 will be described with reference to FIG. 2 .
- the inclination angle ⁇ of the inclined portion 20 is 20 degrees or less with respect to the tire circumferential direction.
- the groove 18 is formed at a position closer to the tire equator line CL than the tread surface end TE on the wall surface of the stepping end of the intermediate block 31 .
- the groove 18 is formed inside in the tire width direction toward the tire radial direction and is opened to the lateral groove 15 a .
- the shape of the groove 18 is not limited to a quadrangular shape, and various shapes can be applied.
- the notch 19 is formed at a position closer to the tread surface end TE than the tire equator line CL at the kick-out end of the intermediate block 31 .
- the notch 19 is formed at an outer end in the tire width direction at the kick end of the intermediate blocks 31 .
- the notch 19 is formed at a position where the lateral groove 15 b and the circumferential groove 12 a cross.
- both the groove 18 and the notch 19 are not formed in one intermediate block 31 .
- Either the groove 18 or the notch 19 is formed in one intermediate block 31 .
- the intermediate block 31 where the groove 18 is formed and the intermediate block 31 where the notch 19 is formed are alternately formed along the tire circumferential direction.
- Both the groove 18 and the notch 19 can be formed in one intermediate block 31 .
- the notch 19 is formed at the position where the lateral groove 15 b and the circumferential groove 12 a cross.
- the air flowing from the shoulder groove 17 flows through the circumferential groove 12 a and the notch 19 into the lateral groove 15 b .
- the air flowing from the shoulder groove 17 efficiently flows into the lateral groove 15 b .
- heat radiation of the tread portion is promoted and the tread portion is cooled.
- the inclined portion 20 is formed, as shown by an arrow 50 in FIG. 4 , when the heavy load tire 100 rotates, the air easily flows through the lateral groove 14 b and the circumferential groove 11 a into the lateral groove 15 b .
- the groove 18 is formed, as shown by an arrow 52 in FIG. 4 , when the heavy load tire 100 rotates, the air easily flows into the lateral groove 15 b.
- the air easily flows into the tread portion (the lateral groove 15 b ). By this air flow, heat radiation of the tread portion is promoted and the tread portion is cooled.
- the inventor evaluated the performance of the heavy load tire 100 according to the present embodiment (hereinafter referred to as the example) and the conventional tire without the notch 19 , the inclined portion 20 , and the groove 18 (hereinafter referred to as the comparative example) by simulation.
- the simulation was performed using FEM (finite element method).
- the simulation result is shown in FIG. 5 .
- FIG. 5 it can be seen that the belt temperature of the example is lower than the belt temperature of the comparative example at each position of the heavy load tire 100 .
- “CL” shows the tire equator line.
- When the tread width is W, “1 ⁇ 8” shows a position advanced by 0.125 W from the tire equator line CL toward outside in the tire width direction.
- “1 ⁇ 4” shows a position advanced by 0.25 W from the tire equator line CL toward outside in the tire width direction.
- “3 ⁇ 8” shows a position advanced by 0.375 W from the tire equator line CL toward outside in the tire width direction.
- “Sho” shows the tread surface end TE.
- W 2 /W 1 is in the range of 5% to 30%.
- W 2 /W 1 may be in the range of 10% to 20%.
- W 4 /W 3 is in the range of 10% to 40%.
- W 6 /W 5 is in the range of 10% to 40%.
- the lateral groove 15 a and the lateral groove 15 b are inclined in the tire width direction from outside in the tire width direction toward the tire equator line CL with the bending point as a boundary.
- the inclination angle ⁇ 2 of the lateral groove 15 a and the lateral groove 15 b with respect to the tire width direction is 5 to 60 degrees.
- the heavy load tire 100 according to the embodiment obtains the following working and effects.
- the inclined portion 20 inclined inward in the tire radial direction toward the end portion is formed on the whole surface of one end portion in the tire circumferential direction of the center block 30 .
- the inclination angle ⁇ of the inclination portion is less than 20 degrees with respect to the tire circumferential direction.
- the groove 18 is formed inside in the tire width direction.
- W 3 the length from the side wall of the intermediate block 31 inside in the tire width direction to the side wall of the groove 18 outside in the tire width direction.
- W 4 /W 3 is in the range of 10% to 40%.
- One end of the lateral groove 15 a (the lateral groove 15 b ) communicates with the circumferential groove 11 a , but does not communicate with the lateral groove 14 a (the lateral groove 14 b ).
- the lateral grooves 15 a (the lateral groove 15 b ) communicates with the lateral groove 14 a (the lateral groove 14 b )
- the lateral groove 15 a (the lateral groove 15 b ) does not communicates with the lateral groove 14 a (the lateral groove 14 b ).
- the present invention is not limited thereto.
- the lateral groove 15 a and the lateral groove 15 b can have a linear shape.
- the inclination angle ⁇ 2 shown in FIG. 8 is the same as the inclination angle ⁇ 2 shown in FIG. 6 .
- a groove depth of the shoulder groove 17 is deeper than a groove depths of the circumferential groove 11 a , the circumferential groove 12 a , the lateral groove 15 a , and the lateral groove 15 b .
- the groove depths of the circumferential groove 11 a , the circumferential groove 12 a , the lateral groove 15 a , and the lateral groove 15 b can be the same or different, respectively.
- the groove depth of the circumferential groove 11 a can be deeper than the groove depths of the circumferential groove 12 a , the lateral groove 15 a , and the lateral groove 15 b .
- Such the groove depth provides the same effect as that described above.
- the groove widths of the circumferential groove 10 , the circumferential groove 11 a , the circumferential groove 11 b , the circumferential groove 12 a , and the circumferential groove 12 b are not particularly limited.
- the groove widths of the circumferential groove 10 , the circumferential groove 11 a , the circumferential groove 11 b , the circumferential groove 12 a , and the circumferential groove 12 b are 3 mm to 30 mm.
- a fin can be provided in a buttress portion of the heavy load tire 100 (not shown).
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Abstract
Description
- The present invention relates to heavy load tires.
- A groove width of a lateral groove provided in a heavy load tire may be large (Patent Document 1). When the groove width of the lateral groove is large as in a case of the heavy load tire according to Patent Document 1, air easily flow into the lateral groove during traveling, and a tread portion is cooled by the air. Therefore, a heat storage in the tread portion is small.
- [Patent Document 1] Japanese Patent Application Publication No. 2014-8904
- However, when the groove width of the lateral groove is large as in the case of the heavy load tire according to Patent Document 1, a wear performance is disadvantageous. On the other hand, simply reducing the groove width of the lateral groove improves the wear performance, but increases the heat storage in the tread portion.
- In view of the foregoing problem, the present invention provides a heavy load tire capable of efficiently cooling a tread portion even when a groove width of a lateral groove is small.
- A heavy load tire comprises a plurality of circumferential grooves extending along a tire circumferential direction; a plurality of lateral grooves extending along a tire width direction and formed in a direction crossing the circumferential grooves; and a plurality of blocks partitioned by the circumferential grooves and the lateral grooves. On a whole surface of one end portion in the tire circumferential direction of a center block formed in a center area among the plurality of blocks, an inclined portion inclined inward in a tire radial direction toward the end portion is formed.
- According to the present invention, the tread portion can be efficiently cooled.
-
FIG. 1 is a plan view showing a tread surface of a heavy load tire according to an embodiment of the present invention. -
FIG. 2 is a cross-sectional view along line A-A ofFIG. 1 . -
FIG. 3 is a cross-sectional view along line B-B ofFIG. 1 . -
FIG. 4 is a plan view showing the tread surface of the heavy load tire according to an embodiment of the present invention. -
FIG. 5 is a graph showing the relationship between each tire position and belt temperature. -
FIG. 6 is a plan view showing the tread surface of the heavy load tire according to an embodiment of the present invention. -
FIG. 7 illustrates air flow. -
FIG. 8 is a plan view showing the tread surface of the heavy load tire according to an embodiment of the present invention. - Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the illustration of the drawings, the same constituents are denoted by the same reference signs, and description thereof is omitted.
- The configuration of a
heavy load tire 100 will be described with reference toFIG. 1 . Theheavy load tire 100 according to the present embodiment is applied to a heavy load vehicle such as a construction vehicle. - As shown in
FIG. 1 , on a tread portion of theheavy load tire 100, a circumferential groove 10 (first circumferential groove) extending along a tire circumferential direction is formed. Thecircumferential groove 10 is formed on a tire equator line CL. - A
circumferential groove 11 a (second circumferential groove) is formed on right side of thecircumferential groove 10 so as to be adjacent to thecircumferential groove 10 along the tire width direction. Similarly, acircumferential groove 11 b (second circumferential groove) is formed on left side of thecircumferential groove 10 so as to be adjacent to thecircumferential groove 10 along the tire width direction. - Further, a plurality of lateral grooves (the
lateral grooves circumferential groove 10 and thecircumferential groove 11 a are formed. Thelateral grooves 14 a (third lateral groove) and thelateral grooves 14 b are formed so as to be adjacent to each other along the tire circumferential direction. Thelateral grooves lateral groove 14 a and the groove width of thelateral groove 14 b is 3 mm to 30 mm. - A plurality of
center blocks 30 are partitioned by thecircumferential groove 10, thecircumferential groove 11 a, thelateral groove 14 a, and thelateral groove 14 b. Thecenter blocks 30 are formed in a center area of theheavy load tire 100. In this embodiment, the center area is defined as an area in the vicinity of the center in the tire width direction from thecircumferential groove 10 to thecircumferential groove 11 a (thecircumferential groove 11 b). - In a shoulder area of the
heavy load tire 100, acircumferential groove 12 a (third circumferential groove), ashoulder block 32, and ashoulder groove 17 are formed. Theshoulder groove 17 opens at a tread surface end TE and communicates with thecircumferential groove 12 a and thelateral groove 15 a. Thecircumferential groove 12 a is formed on the right side of thecircumferential groove 11 a so as to be adjacent to thecircumferential groove 11 a along the tire width direction. In this embodiment, the shoulder area is defined as an area located outside the center area in the tire width direction. The tread surface end TE is an outermost position in the tire width direction of a tire surface (tread surface) in contact with the ground. Thecircumferential groove 12 a (thecircumferential groove 12 b) is formed outside thecircumferential groove 11 a (thecircumferential groove 11 b) in the tire width direction. - In the shoulder area, a plurality of lateral grooves communicate with the
circumferential grooves 11 a and thecircumferential grooves 12 a (thelateral grooves lateral grooves 15 a (first lateral groove) and thelateral grooves 15 b (second lateral groove) are formed along the tire width direction. Thelateral groove 15 a and thelateral groove 15 b have one bending point. Thelateral groove 15 a and thelateral groove 15 b are inclined in the tire width direction from outside in the tire width direction toward the tire equator line CL with the bending point as a boundary. - A plurality of
intermediate blocks 31 are partitioned by thecircumferential groove 11 a, thecircumferential groove 12 a, thelateral groove 15 a, and thelateral groove 15 b. In other words, theintermediate blocks 31 are formed between thecenter blocks 30 and theshoulder blocks 32. The groove width of thelateral groove 15 a and the groove width of thelateral groove 15 b is 3 mm to 30 mm. - As shown in
FIG. 1 , one end of thelateral groove 15 a and thelateral groove 15 b communicates with thecircumferential groove 11 a, but does not communicate with thelateral groove 14 a or thelateral groove 14 b. A position where one end of thelateral groove 15 a and thelateral groove 15 b communicates with thecircumferential groove 11 a is the center of thecenter blocks 30 in the tire circumferential direction. However, is not limited to this case. As long as the position where one end of thelateral groove 15 a and thelateral groove 15 b communicates with thecircumferential groove 11 a is near the center of thecenter blocks 30 in the tire circumferential direction, a slight deviation is allowed. The pitches of thecenter blocks 30 and theintermediate blocks 31 are deviated in the tire circumferential direction. - One end of the
lateral groove 15 a communicates with thecircumferential groove 11 a, and the other end of thelateral groove 15 a communicates with thecircumferential groove 12 a and theshoulder groove 17. On the other hand, one end of thelateral groove 15 b communicates with thecircumferential groove 11 a, and the other end of thelateral groove 15 b communicates with thecircumferential groove 12 a. However, the other end of thelateral groove 15 b does not communicate with theshoulder groove 17. That is, in the plurality of lateral grooves (thelateral grooves circumferential groove 11 a and thecircumferential groove 12 a, there are lateral grooves communicating with the shoulder groove 17 (thelateral groove 15 a) and lateral grooves not communicating with the shoulder groove 17 (thelateral groove 15 b). - At a part of a stepping end of the
intermediate block 31, agroove 18 is formed. At a part of the kick-out end of theintermediate block 31, anotch 19 is formed. The stepping end of theintermediate block 31 is a portion that contacts the ground first when theheavy load tire 100 rotates. As shown inFIG. 3 , on the wall surface of the stepping end of theintermediate block 31, thegroove 18 is formed toward the tire radial direction. Thegroove 18 and thenotch 19 will be described later. - On a whole surface of the stepping end of the center blocks 30 in the tire width direction, an
inclined portion 20 inclined inward in the tire radial direction toward the end portion is formed. In other words, on the whole surface of one end in the tire circumferential direction of thecenter block 30, theinclined portion 20 inclined along the tire circumferential direction is formed. Theinclined portion 20 will be described with reference toFIG. 2 . As shown inFIG. 2 , the inclination angle θ of theinclined portion 20 is 20 degrees or less with respect to the tire circumferential direction. By forming theinclined portion 20, as shown by an arrow inFIG. 2 , when theheavy load tire 100 rotates, air easily flows into thelateral groove 14 a and thelateral groove 14 b. By this air flow, heat radiation of the tread portion is promoted and the tread portion is cooled. - Next, with reference to
FIG. 4 , thegroove 18 formed in theintermediate block 31 and thenotch 19 will be described. - As shown in
FIG. 4 , thegroove 18 is formed at a position closer to the tire equator line CL than the tread surface end TE on the wall surface of the stepping end of theintermediate block 31. In other words, on the wall surface of the stepping end of theintermediate block 31, thegroove 18 is formed inside in the tire width direction toward the tire radial direction and is opened to thelateral groove 15 a. The shape of thegroove 18 is not limited to a quadrangular shape, and various shapes can be applied. - The
notch 19 is formed at a position closer to the tread surface end TE than the tire equator line CL at the kick-out end of theintermediate block 31. In other words, thenotch 19 is formed at an outer end in the tire width direction at the kick end of the intermediate blocks 31. Moreover, in other words, thenotch 19 is formed at a position where thelateral groove 15 b and thecircumferential groove 12 a cross. - Also, both the
groove 18 and thenotch 19 are not formed in oneintermediate block 31. Either thegroove 18 or thenotch 19 is formed in oneintermediate block 31. In this embodiment, theintermediate block 31 where thegroove 18 is formed and theintermediate block 31 where thenotch 19 is formed are alternately formed along the tire circumferential direction. However, is not limited to this case. Both thegroove 18 and thenotch 19 can be formed in oneintermediate block 31. - Next, the effect of the
groove 18 and thenotch 19 will be described. As shown inFIG. 4 , since thelateral groove 15 a communicates with theshoulder groove 17, the air flowing from theshoulder groove 17 easily flows into thelateral groove 15 a. On the other hand, since thelateral groove 15 b does not communicate with theshoulder groove 17, the air flowing from theshoulder groove 17 hardly flows into thelateral groove 15 b. Since the air flowing from theshoulder groove 17 hits the side wall of theintermediate block 31 outside in the tire width direction and flows in various directions, the air flowing into thelateral groove 15 b becomes relatively small. Therefore, in this embodiment, in theintermediate block 31, thenotch 19 is formed at the position where thelateral groove 15 b and thecircumferential groove 12 a cross. As shown by anarrow 51 inFIG. 4 , the air flowing from theshoulder groove 17 flows through thecircumferential groove 12 a and thenotch 19 into thelateral groove 15 b. By forming thenotch 19 in this manner, the air flowing from theshoulder groove 17 efficiently flows into thelateral groove 15 b. By this air flow, heat radiation of the tread portion is promoted and the tread portion is cooled. - Also, since the
inclined portion 20 is formed, as shown by anarrow 50 inFIG. 4 , when theheavy load tire 100 rotates, the air easily flows through thelateral groove 14 b and thecircumferential groove 11 a into thelateral groove 15 b. Also, since thegroove 18 is formed, as shown by anarrow 52 inFIG. 4 , when theheavy load tire 100 rotates, the air easily flows into thelateral groove 15 b. - As described above, by forming the
notch 19, theinclined portions 20, and thegrooves 18, when theheavy load tire 100 rotates, the air easily flows into the tread portion (thelateral groove 15 b). By this air flow, heat radiation of the tread portion is promoted and the tread portion is cooled. - The inventor evaluated the performance of the
heavy load tire 100 according to the present embodiment (hereinafter referred to as the example) and the conventional tire without thenotch 19, theinclined portion 20, and the groove 18 (hereinafter referred to as the comparative example) by simulation. The simulation was performed using FEM (finite element method). The simulation result is shown inFIG. 5 . As shown inFIG. 5 , it can be seen that the belt temperature of the example is lower than the belt temperature of the comparative example at each position of theheavy load tire 100. In the horizontal axis ofFIG. 5 , “CL” shows the tire equator line. When the tread width is W, “⅛” shows a position advanced by 0.125 W from the tire equator line CL toward outside in the tire width direction. “¼” shows a position advanced by 0.25 W from the tire equator line CL toward outside in the tire width direction. “⅜” shows a position advanced by 0.375 W from the tire equator line CL toward outside in the tire width direction. “Sho” shows the tread surface end TE. - Next, with reference to
FIG. 6 , theinclined portion 20 and thegroove 18 will be described. - As shown in
FIG. 6 , when a length of thecenter block 30 along the tire circumferential direction is W1 and a length of theinclined portion 20 along the tire circumferential direction is W2, W2/W1 is in the range of 5% to 30%. W2/W1 may be in the range of 10% to 20%. - As shown in
FIG. 6 , when a length of theintermediate block 31 along the tire width direction is W3 and a length from the side wall of theintermediate block 31 inside in the tire width direction to the side wall of thegroove 18 outside in the tire width direction is W4, W4/W3 is in the range of 10% to 40%. - As shown in
FIG. 6 , when s length of theintermediate block 31 along the tire circumferential direction is W5 and a length of thegroove 18 along the tire circumferential direction is W6, W6/W5 is in the range of 10% to 40%. - As described above, the
lateral groove 15 a and thelateral groove 15 b are inclined in the tire width direction from outside in the tire width direction toward the tire equator line CL with the bending point as a boundary. As shown inFIG. 6 , the inclination angle θ2 of thelateral groove 15 a and thelateral groove 15 b with respect to the tire width direction is 5 to 60 degrees. - Next, with reference to
FIG. 7 , at the stepping end of theintermediate block 31, the reason why thegroove 18 is formed inside in the tire width direction will be described. As shown inFIG. 7 , around the shoulder block (outside in the tire width direction), it is generally known that the air flow is disturbed as shown by anarrow 53 due to the influence of the shoulder block. - On the other hand, in the vicinity of the tire equator line CL, as shown by an
arrow 54, turbulence of the air is less than that in the vicinity of the shoulder block. Therefore, when thegroove 18 is formed outside in the tire width direction, the air may hardly flow into thelateral groove 15 b. On the other hand, when thegroove 18 is formed inside in the tire width direction as in the embodiment, the air easily flows into thelateral groove 15 b and cooling of the tread portion is promoted. - As discussed above, the
heavy load tire 100 according to the embodiment obtains the following working and effects. - In the embodiment, on the whole surface of one end portion in the tire circumferential direction of the
center block 30, theinclined portion 20 inclined inward in the tire radial direction toward the end portion is formed. The inclination angle θ of the inclination portion is less than 20 degrees with respect to the tire circumferential direction. By forming theinclined portion 20, as shown by the arrow inFIG. 2 , when theheavy load tire 100 rotates, the air easily flows into thelateral groove 14 a and thelateral groove 14 b. By this air flow, heat radiation of the tread portion is promoted and the tread portion is cooled. - On the wall surface of the stepping end of the
intermediate block 31, thegroove 18 is formed inside in the tire width direction. When the length of theintermediate block 31 along the tire width direction is W3 and the length from the side wall of theintermediate block 31 inside in the tire width direction to the side wall of thegroove 18 outside in the tire width direction is W4, W4/W3 is in the range of 10% to 40%. By forming thegroove 18, as shown by thearrow 52 inFIG. 4 , when theheavy load tire 100 rotates, the air easily flows into thelateral groove 15 b. By this air flow, heat radiation of the tread portion is promoted and the tread portion is cooled. - One end of the
lateral groove 15 a (thelateral groove 15 b) communicates with thecircumferential groove 11 a, but does not communicate with thelateral groove 14 a (thelateral groove 14 b). When thelateral grooves 15 a (thelateral groove 15 b) communicates with thelateral groove 14 a (thelateral groove 14 b), there is a possibility that the air flow is disturbed at the intersection, and that the air hardly flows into each groove. Therefore, in the embodiment, thelateral groove 15 a (thelateral groove 15 b) does not communicates with thelateral groove 14 a (thelateral groove 14 b). By this, the air easily flows into each groove, and the tread portion is efficiently cooled. - While the present invention has been described above by reference to the embodiment, it should be understood that the present invention is not intended to be limited to the descriptions and the drawings composing part of this disclosure. Various alternative embodiments, examples, and technical applications will be apparent to those skilled in the art according to this disclosure.
- For example, it has been described that the
lateral groove 15 a and thelateral groove 15 b have the bending point, the present invention is not limited thereto. As shown inFIG. 8 , thelateral groove 15 a and thelateral groove 15 b can have a linear shape. The inclination angle θ2 shown inFIG. 8 is the same as the inclination angle θ2 shown inFIG. 6 . - A groove depth of the
shoulder groove 17 is deeper than a groove depths of thecircumferential groove 11 a, thecircumferential groove 12 a, thelateral groove 15 a, and thelateral groove 15 b. The groove depths of thecircumferential groove 11 a, thecircumferential groove 12 a, thelateral groove 15 a, and thelateral groove 15 b can be the same or different, respectively. For example, the groove depth of thecircumferential groove 11 a can be deeper than the groove depths of thecircumferential groove 12 a, thelateral groove 15 a, and thelateral groove 15 b. Such the groove depth provides the same effect as that described above. - The groove widths of the
circumferential groove 10, thecircumferential groove 11 a, thecircumferential groove 11 b, thecircumferential groove 12 a, and thecircumferential groove 12 b are not particularly limited. For example, the groove widths of thecircumferential groove 10, thecircumferential groove 11 a, thecircumferential groove 11 b, thecircumferential groove 12 a, and thecircumferential groove 12 b are 3 mm to 30 mm. - A fin can be provided in a buttress portion of the heavy load tire 100 (not shown).
- This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2018-115869, filed on Jun. 19, 2018, the entire contents of which are incorporated herein by reference.
-
- 100 heavy load tire
- 10, 11 a, 11 b, 12 a, 12 b circumferential groove
- 14 a, 14 b, 15 a, 15 b lateral groove
- 17 shoulder groove
- 18 groove
- 20 inclined portion
- 30 center block
- 31 intermediate block
- 32 shoulder block
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2018115869A JP6954867B2 (en) | 2018-06-19 | 2018-06-19 | Heavy load tires |
JP2018-115869 | 2018-06-19 | ||
PCT/JP2019/017396 WO2019244476A1 (en) | 2018-06-19 | 2019-04-24 | Heavy-load tire |
Publications (2)
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US20210260928A1 true US20210260928A1 (en) | 2021-08-26 |
US11827060B2 US11827060B2 (en) | 2023-11-28 |
Family
ID=68984012
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Application Number | Title | Priority Date | Filing Date |
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US17/254,084 Active 2040-08-19 US11827060B2 (en) | 2018-06-19 | 2019-04-24 | Heavy load tire |
Country Status (5)
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US (1) | US11827060B2 (en) |
EP (1) | EP3795384B1 (en) |
JP (1) | JP6954867B2 (en) |
CN (1) | CN112334331B (en) |
WO (1) | WO2019244476A1 (en) |
Cited By (1)
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---|---|---|---|---|
USD949778S1 (en) * | 2019-07-17 | 2022-04-26 | Bridgestone Corporation | Tire tread |
Families Citing this family (2)
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FR3124436B1 (en) * | 2021-06-24 | 2024-05-03 | Michelin & Cie | Tire tread for a heavy civil engineering vehicle with an improved robustness/thermal compromise |
JP2023170402A (en) * | 2022-05-19 | 2023-12-01 | 株式会社ブリヂストン | Tire for construction vehicle |
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Also Published As
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JP2019217873A (en) | 2019-12-26 |
EP3795384A1 (en) | 2021-03-24 |
JP6954867B2 (en) | 2021-10-27 |
EP3795384B1 (en) | 2023-10-11 |
US11827060B2 (en) | 2023-11-28 |
EP3795384A4 (en) | 2022-03-09 |
WO2019244476A1 (en) | 2019-12-26 |
CN112334331A (en) | 2021-02-05 |
CN112334331B (en) | 2022-12-13 |
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